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Stock Option Plans and Agreements (Tables)
9 Months Ended
Sep. 30, 2022
Stock Option Plans and Agreements  
Stock option valuation assumptions

Risk-free interest rate

 

1.26%-3.35

%

Expected dividend yield

 

 

0%

Expected stock price volatility

 

110%-130

%

Expected life of options (years)

 

 

2.75

 

Stock option activity

 

 

Number of

 

 

Weighted

 

 

Remaining

 

Aggregate

 

 

 

Options

 

 

Average

 

 

Contractual

 

Intrinsic

 

 

 

Outstanding

 

 

Exercise Price

 

 

Term

 

Value

 

Outstanding at December 31, 2021

 

 

143,427

 

 

$5.85

 

 

 

 

 

 

Granted

 

 

1,403

 

 

 

9.49

 

 

 

 

 

 

Exercised

 

 

(5,668)

 

 

3.00

 

 

 

 

 

 

Expired

 

 

(7,106)

 

 

4.87

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Outstanding at September 30, 2022

 

 

132,506

 

 

$6.06

 

 

2.9 years

 

$289,700

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

At September 30, 2022- vested or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

expected to vest

 

 

132,056

 

 

$6.06

 

 

2.9 years

 

$289,700

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Exercisable

 

 

131,922

 

 

$6.06

 

 

2.9 years

 

$289,700